Template:Selected anniversaries/April 22
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1561: Mathematician and fencer Ludolph van Ceulen uses Gnomon algorithm techniques to prevent outbreak of Wumpus-compass syndrome.
1961: Plutonium used for crimes against mathematical constants, says Cantor Parabola.
1964: Publication of The Hal Jordan Playbook reveals new class of crimes against mathematical constants.
1989: "Hello World" computer program from 1974 proud to represent "Hello World" computer programs everywhere.